LM96000

LM96000 Hardware Monitor with Integrated Fan Control November 2004 LM96000 Hardware Monitor with Integrated Fan Control General Description The LM96000, hardware monitor, has a two wire digital interface compatible with SMBus 2.0. Using an 8-bit Σ∆ ADC, the LM96000 measures: – the temperature of two remote diode connected transistors as well as its own die – the VCCP, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (internal scaling resistors). To set fan speed, the LM96000 has three PWM outputs that are each controlled by one of three temperature zones. High and low PWM frequency ranges are supported. The LM96000 includes a digital filter that can be invoked to smooth temperature readings for better control of fan speed. The LM96000 has four tachometer inputs to measure fan speed. Limit and status registers for all measured values are included. n n n n n n n n Noise filtering of temperature reading for fan control 1.0˚C digital temperature sensor resolution 3 PWM fan speed control outputs Provides high and low PWM frequency ranges 4 fan tachometer inputs Monitors 5 VID control lines 24-pin TSSOP package XOR-tree test mode Key Specifications Voltage Measurement Accuracy Resolution Temperature Sensor Accuracy Temperature Range — LM96000 Operational — Remote Temp Accuracy n Power Supply Voltage n Power Supply Current n n n n ± 2% FS (max) 8-bits, 1˚C ± 3˚C (max) 0˚C to +85˚C 0˚C to +125˚C +3.0V to +3.6V 0.53 mA Features n 2-wire, SMBus 2.0 compliant, serial digital interface n 8-bi...